Method of removing superfluous metallic coating from sheet metal.



No. 794.168- I PATENTED JULY 11, 1905- 0. S. FELLOWS & Ai E. HOPKINS.

METHOD OF REMOVING SUPERFLUOUS METALLIG COATING FROM SHEET METAL.

APPLIUATION mum SEPT. 29, 1904. Y

NiTnn STATES Patented July 11, 1905.

PATENT Fries.

OLIN S. FELLOWS AND ARCHIBALD E. HOPKINS, OF MIDDLETOVVN,

NEW YORK.

METHOD OF REMOVING SUPERFLUOUS METALLIC COATING FROM SHEET METAL.

SPECIFICATION forming part of Letters Patent No. 794,168, dated. July 11, 1905.

Application filed September 29, 190a. Serial No. 226,441.

To all whom, it ntay concern.-

Be it known that we, OLIN S. FELLOWS and AROHIBALD E. HOPKINS, citizens of the United States,residingat l\/liddletown,Orangecounty, and State of New York, have invented certain new and useful Improvements in Methods of Removing Superfluous Metallic Coating from Sheet Metal, of which the following is a specification sufiicient to enable others skilled in the art to which the invention appertains to make and use the same.

Our invention relates to a method of removing superfluous metallic coating from sheet metal after such coating has set or hardened upon the surface of the sheet, particularly what is known as list from the selvage edge of metallic plates coated with tin, lead, zinc, or other metal or alloy, the list being occasioned by the collection of an excess of the metallic coating upon the lower edge of the sheet of metal as drawn from the rolls or bath, resulting ordinarily heretofore in a waste of the metallic coating and of the sheet metal, since the selvage edge of the plate with the list on it is not available for use, for reasons well known in the arts in which coated sheet metal is employed. i

The object of our invention is to save the list or excess of metallic coating and at the same time to render' all parts of the coated sheet, including the selvage edge, available for practical use, the plate being thus perfected and rendered more valuable commercially and otherwise; and our invention consists in the method hereinafter set forth for displacing all excess of the positively set or hardened metallic coating from sheet metal, the essential and distinguishing feature being the remelting or liquefying 7'01 aft w of the set or hardened list or superfluous metallic coating and its removal from the sheet metal by a fluid blast or blasts.

In the accompanying drawings, Figure 1 is a plan of parts essential in treating coated sheet-metal plates according to our invention. Fig. 2 is a side elevation of the same. Fig. 3 is an elevation taken upon the side opposite to that shown in Fig. 2 and illustrating diagrammatically the position of the selvage edge of a coated sheet-metal plate under treatment. Fig. 4 is a transverse section upon plane of line 4 4;, Fig. 3.

In describing the practical application of our improved method of displacing superfluous coating or listfrom sheet metal we herein refer to the treatment of tinned sheet-iron only by way of illustration, it being understood that we do not limit ourselves in this respect and that sheet-metal plates and metallic coatings of all kinds are included within the scope of our invention.

In the drawings, A represents an elongated gas-burner or equivalent means of heating the sellvage edge or other portion of a tin-coated p ate.

a designates the plate, and b the list or excess of coating. The plate in its presentation to the reheating device and to the listremoving means may be supported in any suitable manner. (Not shown.)

B designates one or more nozzles arranged to direct a blast or blasts of a suitable fluid, as steam, air, or heated water, against the heated portion of the plate a, the direction of the blast with relation to the plate and the list 6 being such as to drive the liquefied list or excess of metallic coating from the edge thereof, as will be understood by reference more particularly to Fig. 4:. The excess of tin or other metallic coating thus removed from the plate may be collected and utilized in any suitable manner.

We are aware that various expedients have been proposed for the prevention of an excess of coating on metal plates du ring manufacture; but we are not aware that list or excess of metallic coating after it has set or hardened on sheet metal has ever been remelted and displaced therefrom, as herein described and claimed.

Our method of remelting or liquefying the list or excess of metallic coating after the preliminary steps in the manufacture of the plate has certain practical advantages. The manipulation of the sheet metal to thus finish it after it has been coated and cooled may be accomplished with ease and convenience in a simple manner and by simple means, and a perfectly uniform plate of increased commercial value may be produced in which the socalled selvage edge may be said to be eliminated, since it is rendered available for use like the rest of the plate.

Weherein expressly disclaim any method of preventing the formation of an excess of metallic coating upon sheet or other form of metal during the operation of coating the same or before the coating has positively set or hardened on the surface of the metal. We have found that it is not practicable to remove the excess of metallic coating from the sheet metal during the coating process immediately after the sheet metal leaves the finishing-rolls and before the list has had time to set or harden, for the reason that in such case the excess of coating would fall upon the finishing-rolls and into the oil above the metallic bath, contaminating both and causing the defacementofsucceeding plates. Furthermore, the snapping of the rolls as the sheet leaves them is what causes the list. It is therefore to be understood that our invention relates to' a supplementary or finishing process distinct from the operation of applying the metallic coating to the metal. We do not seek to prevent the formation of list or excess of metal lic coating upon the plate, but We do effect the removal or elimination of such list or excess subsequent to the formation thereof and after the same has positively set or hardened upon the surface of the sheet metal. .It is obvious that in accomplishing this result various modifications and mechanical 'expedients may be resorted to in effecting the liquation and displacement of the list or excess of metallic coating from the sheet metal without departing from the spirit and intent of our invention, and we do not, therefore, limit ourselves to the construction and arrangement of parts shown; but

WVhat we claim as our invention, and desire to secure by Letters Patent, is'

1. The method of removing superfluous metallic coating from sheet metal after the same has been coated and the coating positively set or hardened on the sheet metal, which consists in remelting the set or hardened excess of metallic coating in sit u, and then positively removing the said remelted excess from the sheet metal.

2. The method of removing superfluous metallic coating from sheet metal after the same has been coated and the coating positively set or hardened on the sheet metal, which consists in remelting the set or hardened excess of metallic coating in sit u, and then positively removing the said excess of metallic coating from the sheet metal by a fluid-blast.

3. The method of removing superfluous metallic coating from sheet metal after the same has been coated and the coating positively set or hardened on the sheet metal, which consists in remelting the set or hardened excess of metallic coating in swim, and then positively removing the said remelted excess from the sheet metal by a plurality of fluid-blasts.

OLIN S. FELLOWS. AROHIBALD E. HOPKINS.

Witnesses:

D. W. GARDNER, GEO. WM. MIATT. 

